The stock market is not like sports gambling because it is connected to actual economic activity and it can be positive sum (everyone wins), unless you are talking about degenerate derivatives like zero day options, which are like gambling and Utah probably would like to ban or make less accessible to uninformed 18 year olds. It's a lot harder to know where to draw the line in financial markets, and that is where lawyers perhaps should be spending their time figuring out; instead, we live in a world where sports gambling is being pitched as a form of "investment".